On Wed, 2003-10-29 at 09:24, Alan Stern wrote:
no matter which USB-storage-device I attach (tried CD-ROM, Flash Card Reader and memory stick) I get a new scsi host
every time i plug a device in.
so when changing devices for several times I finally end up with /dev/scsi/host0 to 17 or more (diden't go on)
This is a SCSI issue, not a USB one. Maybe someone on the SCSI development list can enlighten us. As far as I can tell, the host number is simply incremented every time a new host, of whatever sort, is added. The numbers never get reused.
This is really a design feature. Not reusing hosts gives us time to clean up the old one before the new one is initialised (and prevents races where we could be trying to plug in a new host at the same time we're cleaning up the old one).
This "design feature" highlights the inadequacy of the SCSI_IOCTL_GET_IDLUN ioctl which only allocates 8 bits for the host number. Back to using the SCSI_IOCTL_GET_BUS_NUMBER ioctl for mapping programs that want to work in both lk 2.4 and lk 2.6 . Since target port ids in iSCSI are url-like (up to 255 chars) and luns can be 64 bits, a more robust "GET_IDLUN" ioctl is needed at some stage.
Perhaps re-using host numbers after they are known to be fully shut down would be saner.
Doug Gilbert
------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
